Flatten a nested dictionary

def flatten(current, key, result):
    if isinstance(current, dict):
        for k in current:
            new_key = "{0}.{1}".format(key, k) if len(key) > 0 else k
            flatten(current[k], new_key, result)
    else:
        result[key] = current
    return result

result = flatten(my_dict, '', {})

print(flatten(_dict1, '', {}))

{'this.example.too': 3, 'example': 'fish', 'this.is.another.value': 4, 'this.is.an.example': 2}

Flatten nested dictionaries, compressing keysStack Overflow